Ruby doesn't reset rescued error var on retry

error_not_reset.rb

failures = 0                                               
begin                                                      
  raise "failed with failures: #{failures}" if failures < 3
  puts "did not fail"                                      
rescue => e                                                
  puts "rescued #{e}"                                      
  failures += 1                                            
  retry if failures < 5                                    
  raise "re-raising"                                       
ensure                                                     
  puts "ensure: failures: #{failures}, e: #{e}"            
end                                                        

output

% ruby error_reset.rb
rescued failed with failures: 0                                  
rescued failed with failures: 1                                  
rescued failed with failures: 2                                  
did not fail                                                     
ensure: failures: 3, e: failed with failures: 2